<div id="list_menu" align="right">
    <ul>
        <li  class="nav_link"><a href="#" id="parent" >Product Management</a>
            <div class="sub_menu">
                <ul>
                     <li><a href="list_categories.jsp">Product Category</a></li>
                    <li><a href="add_category.jsp">Add Product Category</a></li>
                    <li><a href="products.jsp">Product List</a></li>
                    <li><a href="list_warehouse.jsp">WareHouse</a></li>
                    <li class="last"><a href="list_factory.jsp">Factory</a></li>
                </ul>
            </div>
        </li>   
    </ul>
</div>
<!--END list_menu-->